<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>
    <el-form label-width="120px">

      <!-- 章节 -->
      <el-button type="text" @click="openChapterDialog()">添加章节</el-button>

      <ul class="chanpterList">
        <li
          v-for="chapter in chapterVideoList"
          :key="chapter.id">
          <p>
            {{ chapter.title }}
            <span class="acts">
                <el-button style="" type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                <el-button style="" type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
                <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
            </span>
          </p>
          <!-- 视频 -->
          <ul class="chanpterList videoList">
            <li
              v-for="video in chapter.children"
              :key="video.id">
              <p>{{ video.title }}
                <span class="acts">
                <el-button style="" type="text" @click="openEditVider(video.id)">编辑</el-button>
                <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
            </span>
              </p>
            </li>
          </ul>
        </li>
      </ul>
      <div>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </div>

      <!-- 添加和修改 章节 表单 -->
      <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
        <el-form :model="chapter" label-width="120px">
          <el-form-item label="章节标题">
            <el-input v-model="chapter.title"/>
          </el-form-item>
          <el-form-item label="章节排序">
            <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
          </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
          <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
        </div>
      </el-dialog>

      <!-- 添加和修改 课时 表单 -->
      <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
        <el-form :model="video" label-width="120px">
          <el-form-item label="课时标题">
            <el-input v-model="video.title"/>
          </el-form-item>

          <el-form-item label="课时排序">
            <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
          </el-form-item>

          <el-form-item label="是否免费">
            <el-radio-group v-model="video.free">
              <el-radio :label="true">免费</el-radio>
              <el-radio :label="false">默认</el-radio>
            </el-radio-group>
          </el-form-item>

          <!-- 上传视频-->
          <el-form-item label="上传视频">
            <el-upload
              :on-success="handleVodUploadSuccess"
              :on-remove="handleVodRemove"
              :before-remove="beforeVodRemove"
              :on-exceed="handleUploadExceed"
              :file-list="fileList"
              :action="BASE_API+'/eduvod/video/uploadAlyVideo'"
              :limit="1"
              class="upload-demo">
              <el-button size="small" type="primary">上传视频</el-button>
              <el-tooltip placement="right-end">
                <div slot="content">最大支持1G，<br>
                  支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                  GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                  MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                  SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                <i class="el-icon-question"/>
              </el-tooltip>
            </el-upload>
          </el-form-item>

        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
          <el-button type="primary" @click="saveOrUpdateVideo">确 定</el-button>
        </div>
      </el-dialog>

    </el-form>
  </div>
</template>

<script>
import chapter from "@/api/edu/chapter";
import video from "@/api/edu/video";

export default {
  data(){
    return{
      saveBtnDisabled:false,
      courseId:'',
      chapterVideoList:[],
      chapter:{
        title: '',
        sort: 0
      },
      video:{
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: '',
        videoOriginalName:''
      },
      dialogChapterFormVisible:false,//章节弹框
      dialogVideoFormVisible:false, //小节弹框
      fileList: [],//上传文件列表
      BASE_API: process.env.BASE_API // 接口API地址

    }
  },


  created(){
    if (this.$route.params && this.$route.params.id){
      this.courseId = this.$route.params.id
      //根据课程id查询章节小节
      this.getChapterVideo()
    }
  },


  methods:{
    //删除上传视频，点击确定的方法
    handleVodRemove(){
      //调用接口 的删除视频方法
      video.deleteAlyvod(this.video.videoSourceId)
      .then(response=>{
        //提示信息
        this.$message({
          type: 'success',
          message: '删除上传视频成功!'
        });
        this.fileList = []
        this.video.videoSourceId = ''
        this.video.videoOriginalName = ''
      })
    },
    beforeVodRemove(file,fileList){
      return this.$confirm(`确定移除 ${file.name}? `);
    },

    //上传视频成功的方法
    handleVodUploadSuccess(response,file,fileList){
      this.video.videoSourceId = response.data.videoId
      this.video.videoOriginalName = file.name
    },
    handleUploadExceed(){
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },
    //==================================== 小节操作 =======================================
    //删除小节
    removeVideo(id){
      this.$confirm('此操作将永久删除小节, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        //调用删除方法
        video.deleteVideo(id)
          .then(response=>{
            //提示信息
            this.$message({
              type: 'success',
              message: '删除小节成功!'
            });
            //回到列表页面
            this.getChapterVideo()
          })
      })
    },

    //添加小节
    //1 打开表单框
    openVideo(chapterId){
      this.dialogVideoFormVisible = true
      this.video = {}
      this.video.videoSourceId = ''
      //设置章节id
      this.video.chapterId = chapterId

    },
    //2 添加数据
    addVideo(){
      //设置课程id
      this.video.courseId = this.courseId
      video.addVideo(this.video)
      .then(response=>{
        //关闭弹窗
        this.dialogVideoFormVisible = false
        //提示
        this.$message({
          type: 'success',
          message: '添加小节成功'
        })
        //刷新页面
        this.getChapterVideo()
      })
    },

    //修改小节
    //1 打开表单框
    openEditVider(videoid){
      this.dialogVideoFormVisible = true
      video.getVideoInfo(videoid)
      .then(response=>{
        this.video = response.data.video
      })
    },
    updateVideo(){
      video.updateVideo(this.video)
      .then(response=>{
        //关闭弹窗
        this.dialogVideoFormVisible = false
        //提示
        this.$message({
          type: 'success',
          message: '修改课时成功'
        })
        //刷新页面
        this.getChapterVideo()
      })
    },
    saveOrUpdateVideo(){
      if (!this.video.id){
        this.addVideo()
      }else {
        this.updateChapter()
      }
    },


    //==================================== 章节操作 =======================================
    //删除章节
    removeChapter(chapterId){
      this.$confirm('此操作将永久删除章节记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        //调用删除方法
        chapter.deleteChapter(chapterId)
          .then(response=>{
            //提示信息
            this.$message({
              type: 'success',
              message: '删除成功!'
            });
            //回到列表页面
            this.getChapterVideo()
          })
      })
    },
    //修改章节弹框数据回显
    openEditChapter(chapterId){
      this.dialogChapterFormVisible = true
      chapter.getChapter(chapterId)
      .then(response=>{
        this.chapter = response.data.chapter
      })
    },
    //弹出添加章节页面
    openChapterDialog(){
      //弹框
      this.dialogChapterFormVisible =true
      //表单数据清空
      this.chapter.title = ''
      this.chapter.sort = 0
    },

    //添加章节
    addChapter(){
      this.chapter.courseId = this.courseId
      chapter.addChapter(this.chapter)
        .then(response=>{
          //关闭弹窗
          this.dialogChapterFormVisible = false
          //提示
          this.$message({
            type: 'success',
            message: '添加章节成功'
          })
          //刷新页面
          this.getChapterVideo()
        })
    },


    //修改章节方法
    updateChapter(){
      chapter.updateChapter(this.chapter)
      .then(response=>{
        //关闭弹窗
        this.dialogChapterFormVisible = false
        //提示
        this.$message({
          type: 'success',
          message: '修改章节成功'
        })
        //刷新页面
        this.getChapterVideo()
      })
    },


    saveOrUpdate(){
      if (!this.chapter.id){
        this.addChapter()
      }else {
        this.updateChapter()
      }
    },

    //根据课程id查询章节小节
    getChapterVideo(){
      chapter.getAllChapterVideo(this.courseId)
      .then(response=>{
        this.chapterVideoList = response.data.allChapterVider
      })
    },

    previous(){
      this.$router.push({path:'/course/info/'+this.courseId})
    },

    next(){
      //跳转到下一步
      this.$router.push({path:'/course/publish/'+this.courseId})
    }
  }
}
</script>
<style scoped>
.chanpterList{
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
  float: right;
  font-size: 14px;
}
.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}
</style>
